[Python-ideas] (no subject)

[Rob Cliffe]

On 29/11/2016 20:09, Terry Reedy wrote:
> On 11/29/2016 11:32 AM, Rob Cliffe wrote:
>>
>>
>> On 29/11/2016 04:58, victor rajewski wrote:
>>>
>>> Traceback (most recent call last):
>>>
>>>  File "foo.py", line 2, in <module>
>>>
>>>    l[10]=14
>>>
>>> IndexError: list assignment index out of range
>>>
>>>
>>> A better message might be:
>>>
>>> You tried to use l[10] when l is only 4 elements long. You can add
>>> items to l using l.append(value), or check your index value to make
>>> sure that's really the position you wanted to access.
>>>
>>>
>>>
>> It would make sense to me to upgrade this particular error message to
>>     IndexError: list assignment index 10 out of range 0 to 3 if it can
>> be done without too much difficulty or overhead.  (An empty list, and
>> perhaps one with only 1 element, would be special cases.)  Come to think
>> of it, is the word "assignment" needed?
>
> It would help if the line were "l1[10] = 2 * l2[13] + 3".
>
You're right of course; "assignment" IS meaningful; I missed it.

 >>> [][0]
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
IndexError: list index out of range